參數(shù)資料
型號(hào)： MAX6660AEE+
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface
中文描述： SPECIALTY ANALOG CIRCUIT, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, QSOP-16
文件頁(yè)數(shù)： 2/21頁(yè)
文件大?。?/td> 271K
代理商： MAX6660AEE+
MAX6660
Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
10
______________________________________________________________________________________
The SMBus interface includes a Timeout, which resets
the interface any time the data or clock line is held low
for more than 35ms, ensuring that the MAX6660 can
never “l(fā)ock” the bus.
Remote Temperature Data Register
Two registers, at addresses 00h and 01h, store the
measured temperature data from the remote diode. The
data format for the remote-diode temperature is 10 bit
+ sign, with each bit corresponding to 0.125°C, in two’s
complement format (Table 2). Register 01h contains the
sign bit and the first 7 bits. Bits 7, 6, 5 of Register 00h
are the 3LSBs. If the two registers are not read at the
same time, their contents may be the result of two dif-
ferent temperature measurements leading to erroneous
temperature data. For this reason, a parity bit has been
added to the 00h register. Bit 4 of this is zero if the data
in 00h and 01h are from the same temperature conver-
sion and are 1 if they are not. The remaining bits are
“don’t cares.” When reading temperature data, register
01h must be read first.
Alarm Threshold Registers
The MAX6660 provides four alarm threshold registers
that can be programmed with a two’s complement tem-
perature value with each bit corresponding to 1°C. The
registers are THIGH, TLOW, TMAX, and THYST. If the
measured temperature equals or exceeds THIGH, or is
less than TLOW, an ALERT interrupt is asserted. If the
measured temperature equals or exceeds TMAX, the
OVERT output is asserted (see Over-Temperature
Output (OVERT) section). If ALERT and OVERT are acti-
vated by the temperature exceeding TMAX, they can
only be deasserted by the temperature dropping below
THYST. The POR state for THIGH is +127°C, for TLOW is -
55°C, for TMAX is +100°C, and for THYST is +95°C.
Over-Temperature Output (OVERT)
The MAX6660 has an over-temperature output (OVERT)
that is set when the remote-diode temperature crosses
the limits set in the TMAX register. It is always active if
the remote-diode temperature exceeds TMAX. The
OVERT line clears when the temperature drops below
THYST. Bit 1 of the Configuration register can be used
to mask the OVERT output. Typically, the OVERT output
is connected to a power-supply shutdown line to turn
system power off. At power-up, OVERT defaults to
active-low but the polarity can be reversed by setting
bit 5 of the Configuration register.
The OVERT line can be taken active, either by the
MAX6660 or driven by an external source. An external
source can be masked by bit 2 of the Configuration
register. When OVERT is active, the fan loop forces the
fan to full speed and bit 1 of the Status register is set.
Diode Fault Alarm
A continuity fault detector at DXP detects an open cir-
cuit between DXP and DXN. If an open or short circuit
exists, register 01h is loaded with 000 0000.
Additionally, if the fault is an open circuit, bit 2 of the
status byte is set to 1 and the ALERT condition is acti-
vated at the end of the conversion. Immediately after
POR, the Status register indicates that no fault is pre-
sent until the end of the first conversion.
ALERT Interrupts
The ALERT interrupt output signal is activated (unless it
is masked by bit 7 in the Configuration register) when-
ever the remote-diode’s temperature is below TLOW or
exceeds THIGH. A disconnected remote diode (for con-
tinuity detection), a shorted diode, or an active OVERT
also activates the ALERT signal. The activation of the
ALERT signal sets the corresponding bits in the Status
register. There are two ways to clear the ALERT: send-
ing the ALERT Response Address or reading the Status
register.
The interrupt does not halt automatic conversions. New
temperature data continues to be available over the
SMBus interface after ALERT is asserted. ALERT is an
active-low open-drain output so that devices can share
a common interrupt line. The interrupt is updated at the
end of each temperature conversion so, after being
cleared, reappears after the next temperature conver-
sion, if the cause of the fault has not been removed.
By setting bit 0 in the Configuration register to 1, the
Status register can only be cleared by sending the
SMBus Alert Response Address (see Alert Response
Address section). Prior to taking corrective action,
always check to ensure that an interrupt is valid by
reading the current temperature. To prevent recurring
interrupts, the MAX6660 asserts ALERT only once per
crossing of a given temperature threshold. To enable a
new interrupt, the value in the limit register that trig-
gered the interrupt must be rewritten. Other interrupt
conditions can be caused by crossing the opposite
temperature threshold, or a diode fault can still cause
an interrupt.
Example: The remote temperature reading crosses
THIGH, activating ALERT. The host responds to the
interrupt and reads the Alert Response Address, clear-
ing the interrupt. The system may also read the status
byte at this time. If the condition persists, the interrupt
reappears. Finally, the host writes a new value to
THIGH. This enables the device to generate a new
THIGH interrupt if the alert condition still exists.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX6660AEE+ 功能描述:板上安裝溫度傳感器 Remote-Junction Fan-Speed Regulator RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6660AEE+T 功能描述:板上安裝溫度傳感器 Remote-Junction Fan-Speed Regulator RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6660AEE+-T 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 16QSOP - Tape and Reel
MAX6660AEE-T 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
MAX6660EVKIT 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor
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